captionsline-breaking
I wish to add a line break to a caption, but I would wish to avoid adding of caption package. Is it possible?
\documentclass{article}
\usepackage[format=plain,
justification=raggedright,singlelinecheck=false]{caption}
\begin{document}
\begin{figure}
\caption{This is the caption\\ This is the second line}
\end{figure}
\end{document}
You can use the caption package to format the way the captions are displayed. Yo can also use the ragged2e package to set your caption as ragged right to avoid bad hyphenations.
\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{wrapfig}
\usepackage{caption}
\usepackage{lipsum}
\usepackage{ragged2e}
\DeclareCaptionFormat{myformat}{#1#2\\#3}
\captionsetup[wrapfigure]{name=Figure, justification=RaggedRight, format=myformat}
\begin{document}
\begin{wrapfigure}{R}{2,76cm}
\rule{3cm}{5cm}
\caption{Error Start- Endzeit}
\label{mockup-endtime-error}
\end{wrapfigure}
\lipsum
\end{document}
For such small images, I would recommend you use Fig. rather than the full Figure or the equivalent in German. For more details see the caption manual Section 4.1 Further examples.
I would use a [t]op-aligned \parbox of fixed width. For example, using
\caption{\parbox[t]{4cm}{I would like to put a break here in the caption.}}
in your MWE produces
The same holds if you use a [t]op-aligned tabular:
\caption{%
\begin{tabular}[t]{@{}l}
I would like to put a break here \\ in the caption.
\end{tabular}}
In the \parbox you specify the width, while in the tabular you specify the line break.
Finally, there is the varwidth package that will shrink to the natural width of a box if its contents is narrower than the width specified:
\usepackage{varwidth}% http://ctan.org/pkg/varwidth
%...
\caption{%
\begin{varwidth}[t]{10cm}
I would like to put a break here \\ in the caption.
\end{varwidth}}
Although I've specified 10cm, the natural width (which now allows for line breaking using \\ since the contents is boxed) is narrower.
Best Answer
The reason why
\\does not work originally is that the caption is small enough to fit on one line. The default caption setting first sets the caption in an mbox and if that is less than the line width that box is centred. Otherwise that box is discarded and the caption is re-set in a parbox. On the first setting\\does nothing as it is always a no-op in such a box, on the second setting (if it is used) then\\starts a new line. So all you have to do is make sure that the first setting is not used, as the space at the start of a line is discarded, it doesn't really matter how big the space is, so long as the total natural width of the whole caption is bigger than\textwidth.